When you power the module on, before it ever receives any note, it defaults to a C2 (+2V). This transposes the note by 2 octaves, so if your VCO is tuned to 440Hz, it’ll play at 1760Hz.

You’re doing the maths wrong by the way. The ratio between 1760 and 440 is 4 indeed, but it doesn’t mean that 1760Hz is 4 octaves higher than 440Hz. You have to take the log2 to get the number of octaves (log2 4 = 2).